Who is the world's best fighter, regardless of weight class? Check out ESPN's top 10, which puts Floyd Mayweather Jr. in the top spot and includes two ties. If you have a comment about the rankings, please use #ESPNP4P on Twitter.
Don't forget to check out Dan Rafael's divisional rankings, which are updated weekly.
For a list of the current champions in all weight classes, click here.
Note: Results are through Jan. 20.